wsl-pro-service: Ubuntu Pro token exposed via process command-line arguments (CVE-2026-102371) | HOL Guard CVE

Medium · CVSS 5.7CVE-2026-102371

wsl-pro-service: Ubuntu Pro token exposed via process command-line arguments

Answer in brief

CVE-2026-102371 records a Medium severity (CVSS 5.7) vulnerability in wsl-pro-service: Ubuntu Pro token exposed via process command-line arguments. The current sources do not mark it as known exploited. The current feed maps Canonical/Ubuntu Pro for WSL (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 29, 2026Updated Sep 29, 2026Source checked Sep 29, 2026First seen by HOL Sep 29, 2026Material review Sep 29, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.7
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 5.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Canonical/Ubuntu Pro for WSL (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Canonical/Ubuntu Pro for WSLgeneric	>=0.1.1 <0.1.19ubuntu2 \|\| >=0.1.1 <0.1.18~24.04.3 \|\| >=0.1.1 <0.1.18~22.04.2 \|\| >=0.1.1 <0.1.18~20.04.2	0.1.19ubuntu2, 0.1.18~24.04.3, 0.1.18~22.04.2, 0.1.18~20.04.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for Canonical/Ubuntu Pro for WSL.
Review the reported fix. Update Canonical/Ubuntu Pro for WSL to 0.1.19ubuntu2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 29, 2026

Sources and claim methodology

Upstream source description

In wsl-pro-service before 0.1.19ubuntu3, the service component which runs as root inside each WSL instance attaches the instance to Ubuntu Pro by executing the pro client with the Ubuntu Pro token passed as a command-line argument (pro attach <token>). On systems where /proc is mounted without process-hiding mitigations (such as hidepid), which is the default in WSL, an unprivileged local user or process in the same WSL instance can read the token from /proc/<pid>/cmdline while the attach process is running. The leaked token could then be used to attach other machines to the victim's Ubuntu Pro subscription and gain unauthorized access to Ubuntu Pro services.

Quoted source text, attributed separately from HOL analysis.